CN103121035B - Method of rolling large-diameter non-sized reinforcing steel bars into small-diameter sized reinforcing steel bars - Google Patents
Method of rolling large-diameter non-sized reinforcing steel bars into small-diameter sized reinforcing steel bars Download PDFInfo
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- CN103121035B CN103121035B CN201210463407.9A CN201210463407A CN103121035B CN 103121035 B CN103121035 B CN 103121035B CN 201210463407 A CN201210463407 A CN 201210463407A CN 103121035 B CN103121035 B CN 103121035B
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Abstract
The invention provides a method of rolling large-diameter non-sized reinforcing steel bars into small-diameter sized reinforcing steel bars. According to the method, end heads of two ends of the large-diameter non-sized reinforcing steel bars are subjected to flash-butting welding in an end-to-end mode, then the large-diameter non-sized reinforcing steel bars are transported to an induction heating device and preheated to 700 DEG C with intermediate frequency current at a speed of 45-70m/min, and then heated to 900-1000 DEG C with ultrasonic frequency current at a heating speed of 43-70m/min, and transported to an 8-stand tandem rolling machine. The rolling passes are eight times, the final rolling temperature is 900-980 DEG C, and the rolling speed is 5.0-6.0m/s. The large-diameter non-sized reinforcing steel bars are rolled continuously after being cooled by air, and are cut to length, and then small specification full-sized ribbed steel bars are obtained. Rolling yield is improved, production cost is reduced, and enterprise economic benefit is obviously increased.
Description
Technical field
The invention provides a kind of reinforcing bar milling method, especially a kind of method non-for major diameter scale reinforcing bar being rolled into minor diameter scale reinforcing bar
,belong to metal fever Machining Technology field.
background technology
At present, adopt the hot rolled ribbed bars that continual rolling production line of bar is produced, the product percent of pass (and scale qualification rate) of its yardstick that conforms with the regulations is generally 98 ~ 98.5%, and short chi, non-scale product proportion are 1.5 ~ 2.0%.The price of short chi, non-scale reinforcing bar is starkly lower than scale reinforcing bar in the market, non-scale steel price 200 ~ 300 yuan/ton materials lower than scale reinforcing bar of length 6 ~ 9m; And the short chi steel price of length 3-6m is only 80% (price reduces by 700 ~ 800 yuan/ton of materials on year-on-year basis) of the scale reinforcing bar same period.Short chi, non-scale Gang Shi enterprise rolling lumber recovery reduce, production cost increases, sell difficulty strengthens, and is unfavorable for that enterprise increases economic efficiency.
Summary of the invention
The object of the present invention is to provide a kind of method non-for major diameter scale reinforcing bar being rolled into minor diameter scale reinforcing bar, to play the value potentiality in reinforcing bar production process to greatest extent, reduce production cost, increase economic efficiency.
The present invention is realized by following technical proposal: the non-scale reinforcing bar of a kind of major diameter is rolled into the method for minor diameter scale reinforcing bar, it is characterized in that through the following step:
A, with the diameter produced in the existing hot rolled ribbed bars production process short chi that is Ф 25 ~ 40mm, non-scale reinforcing bar for raw material, butt welding will be carried out by steel bar end between two, remove burr around crator;
B, reinforcing bar steps A welded are sent in heater, with electric current of intermediate frequency, under the speed of 45 ~ 70m/min, preheat reinforcing bar to 700 DEG C, then use superaudio electric current, in the firing rate of 43 ~ 70m/min, and heating reinforcing bar to 900 ~ 1000 DEG C;
Tandem mill sent into by C, the reinforcing bar heated by step B, and be 8 times in rolling pass, finishing temperature is 900-980 DEG C, and mill speed is under the condition of 5.0-6.0m/s, carries out tandem rolling, and after air cooling, cutting to length, namely obtains the full scale Ribbed Bar of small dimension.
The butt welding of described steps A has been welded routinely with conven-tional luster butt welding machine on raw material stand.
The heating of described step B is conventional electromagnetic induction heating apparatus.
The tandem mill of described step C is 8 conventional frame tandem mills.
The shearing of described step C is first sheared by conventional Double Dimension Flying Shears, after cold bed air cooling, then carries out cutting to length with conventional magnetic shear machine.
The present invention has following advantages and beneficial effect: adopt such scheme, the flash butt welding of two two ends can be carried out easily to the short chi reinforcing bar of large gauge, after eddy-current heating, send tandem rolling on 8 frame tandem mills, by the integrated innovation of this technology, make the short chi of large gauge, non-scale reinforcing bar is rolled into the full scale reinforcing bar of small dimension through again processing, improve rolling lumber recovery, reduce production cost, significantly increase business economic interests.
Employing electromagnetic induction heating has the following advantages: heated operating reinforcing bar by frequency conversion electric current, with in the eddy current produced under electromagnetic induction effect, reinforcing bar is heated, and be conducive to the surface oxidation reducing reinforcing bar, scaling loss is only 0.5%; In addition, the easy control of temperature of eddy-current heating, effects of energy saving and emission reduction is remarkable.
Present invention process has that production cost is low, technique applicability and the feature such as controlling is strong, utilize the short chi of large gauge, non-scale reinforcing bar produces the full scale Ribbed Bar of small dimension, its technologic mechanics performance is comprehensive, be better than concrete reinforcement steel GB1499.2 standard, economic benefit and effects of energy saving and emission reduction remarkable.
The full scale Ribbed Bar technologic mechanics performance of small dimension provided by the invention (nominal diameter Φ 8-12mm) is shown in Table 1.
The full scale Ribbed Bar technologic mechanics performance of the small dimension (nominal diameter Φ 8-12mm) that table 1 the present invention produces
Detailed description of the invention
Below in conjunction with embodiment, the present invention is described further.
embodiment 1
A, with the diameter produced in the HRB400 hot rolled ribbed bars production process short chi that is Ф 25mm, non-scale Ribbed Bar for raw material, will between two ribbed bar end on raw material stand, carry out butt welding with conven-tional luster butt welding machine, remove burr around crator afterwards;
Inductor length sent into by B, reinforcing bar steps A welded is in the conventional electromagnetic induction heating apparatus of 24m, with electric current of intermediate frequency, under the speed of 45m/min, preheat reinforcing bar to 700 DEG C, use superaudio electric current again, in the firing rate of 43m/min, heating reinforcing bar to 900 DEG C;
On the tandem mill that 8 rack level that Φ 250 × 4/ Φ 220 × 4 sent into by C, the reinforcing bar heated by step B are arranged, it is 8 times in rolling pass, finishing temperature is 900 DEG C, mill speed is under the condition of 5.0m/s, carry out tandem rolling, first shear by conventional Double Dimension Flying Shears, after cold bed air cooling to room temperature, carry out cutting to length with conventional magnetic shear machine again, namely obtain the small dimension full scale Ribbed Bar product of the same trade mark HRB400 of Φ 8mm.This product is through inspection, and its mechanics and processing performance are better than GB1499.2 requirement comprehensively, are shown in Table 2.
The full scale Ribbed Bar technologic mechanics performance of table 2 small dimension (nominal diameter Φ 8mm)
embodiment 2
A, with the diameter produced in the HRB500 hot rolled ribbed bars production process short chi that is Ф 32mm, non-scale Ribbed Bar for raw material, will between two ribbed bar end on raw material stand, carry out butt welding with conven-tional luster butt welding machine, remove burr around crator afterwards;
Inductor length sent into by B, reinforcing bar steps A welded is in the conventional electromagnetic induction heating apparatus of 24m, with electric current of intermediate frequency, under the speed of 70m/min, preheat reinforcing bar to 700 DEG C, use superaudio electric current again, in the firing rate of 70m/min, heating reinforcing bar to 1000 DEG C;
On the tandem mill that 8 rack level that Φ 250 × 4/ Φ 220 × 4 sent into by C, the reinforcing bar heated by step B are arranged, it is 8 times in rolling pass, finishing temperature is 980 DEG C, mill speed is under the condition of 6.0m/s, carry out tandem rolling, first shear by conventional Double Dimension Flying Shears, after cold bed air cooling to room temperature, carry out cutting to length with conventional magnetic shear machine again, namely obtain the small dimension full scale Ribbed Bar product of the same trade mark HRB500 of Φ 10mm.This product is through inspection, and its mechanics and processing performance are better than GB1499.2 requirement comprehensively, are shown in Table 3.
The full scale Ribbed Bar technologic mechanics performance of table 3 small dimension (nominal diameter Φ 10mm)
embodiment 3
A, with the diameter produced in the HRB600 hot rolled ribbed bars production process short chi that is Ф 40mm, non-scale Ribbed Bar for raw material, will between two ribbed bar end on raw material stand, carry out butt welding with conven-tional luster butt welding machine, remove burr around crator afterwards;
Inductor length sent into by B, reinforcing bar steps A welded is in the conventional electromagnetic induction heating apparatus of 24m, with electric current of intermediate frequency, under the speed of 60m/min, preheat reinforcing bar to 700 DEG C, use superaudio electric current again, under the firing rate of 57m/min, heating reinforcing bar to 950 DEG C;
On the tandem mill that 8 rack level that Φ 250 × 4/ Φ 220 × 4 sent into by C, the reinforcing bar heated by step B are arranged, it is 8 times in rolling pass, finishing temperature is 930 DEG C, mill speed is under the condition of 5.6m/s, carry out tandem rolling, first shear by conventional Double Dimension Flying Shears, after cold bed air cooling to room temperature, carry out cutting to length with conventional magnetic shear machine again, namely obtain the small dimension full scale Ribbed Bar product of the same trade mark HRB600 of Φ 12mm.This product is through inspection, and its mechanics and processing performance are better than GB1499.2 requirement comprehensively, are shown in Table 4.
The full scale Ribbed Bar technologic mechanics performance of table 4 small dimension (nominal diameter Φ 12mm)
Claims (4)
1. the non-scale reinforcing bar of major diameter is rolled into a method for minor diameter scale reinforcing bar, it is characterized in that through the following step:
A, with the diameter produced in the existing hot rolled ribbed bars production process short chi that is Ф 25 ~ 40mm, non-scale reinforcing bar for raw material, butt welding will be carried out by steel bar end between two, remove burr around crator;
B, reinforcing bar steps A welded are sent in heater, with electric current of intermediate frequency, under the speed of 45 ~ 70m/min, preheat reinforcing bar to 700 DEG C, then use superaudio electric current, in the firing rate of 43 ~ 70m/min, and heating reinforcing bar to 900 ~ 1000 DEG C;
Tandem mill sent into by C, the reinforcing bar heated by step B, and be 8 times in rolling pass, finishing temperature is 900-980 DEG C, and mill speed is under the condition of 5.0-6.0m/s, carries out tandem rolling, and after air cooling, cutting to length, namely obtains the full scale Ribbed Bar of minor diameter.
2. the non-scale reinforcing bar of major diameter as claimed in claim 1 is rolled into the method for minor diameter scale reinforcing bar, it is characterized in that the butt welding of described steps A has been welded routinely with conven-tional luster butt welding machine on raw material stand.
3. the non-scale reinforcing bar of major diameter as claimed in claim 1 is rolled into the method for minor diameter scale reinforcing bar, it is characterized in that the heater of described step B is conventional electromagnetic induction heating apparatus.
4. the non-scale reinforcing bar of major diameter as claimed in claim 1 is rolled into the method for minor diameter scale reinforcing bar, it is characterized in that the tandem mill of described step C is 8 conventional frame tandem mills.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210463407.9A CN103121035B (en) | 2012-11-17 | 2012-11-17 | Method of rolling large-diameter non-sized reinforcing steel bars into small-diameter sized reinforcing steel bars |
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| CN201210463407.9A CN103121035B (en) | 2012-11-17 | 2012-11-17 | Method of rolling large-diameter non-sized reinforcing steel bars into small-diameter sized reinforcing steel bars |
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| CN103121035B true CN103121035B (en) | 2015-03-11 |
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| CN112742863B (en) * | 2020-12-04 | 2023-06-09 | 安阳复星合力新材料股份有限公司 | Cold-rolled steel bar production method |
| CN114074115B (en) * | 2021-11-17 | 2024-03-08 | 酒泉钢铁(集团)有限责任公司 | Method for producing stainless steel wire rod by high-speed wire rolling mill |
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| RU2010633C1 (en) * | 1991-09-09 | 1994-04-15 | Черненко Валерий Тарасович | Method of manufacturing rolled sections |
| JP3063608B2 (en) * | 1996-02-23 | 2000-07-12 | 日本鋼管株式会社 | Hot sawing continuous rolling method and equipment |
| US5957367A (en) * | 1996-05-07 | 1999-09-28 | Nkk Corporation | Continuous rolling method of billet and apparatus therefor |
| JP3329186B2 (en) * | 1996-05-28 | 2002-09-30 | 日本鋼管株式会社 | Hot-rolled steel strip rolling method and apparatus |
| JP2002224705A (en) * | 2001-02-07 | 2002-08-13 | Kawasaki Steel Corp | Rolling equipment line for rod material |
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